> ## Documentation Index
> Fetch the complete documentation index at: https://docs.marzipan.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Bundles and options

> Build bundles, add product options, and link upsell and related products

These sections of the product form let you build up what a customer can buy, and what you show them alongside it. Open a product from **Products** in the main navigation menu to find them.

## Bundle items

For a **bundle** product, choose the products included in the bundle and the quantity of each.

<Note>
  Bundle items only appear on products created with the **Bundle** type. The type can't be changed after a product is created.
</Note>

## Options

Define product **options**, for example size, as a list of choices. You can mark an option as **required** so the customer must pick a choice before adding the product to their cart.

## Upsell and related products

* **Upsell products** — alternatives a customer can choose instead of this product, for example a gift box
* **Related products** — products shown alongside this one

## Tier exclusivity

If you use reward tiers, you can restrict a product to specific membership tiers, so only members of those tiers can buy it.